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Old 04-29-2012, 06:14 AM   #1 (permalink)
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Default Changing Maxim works header mainpipe?

Hi guys,
I've just read through Wynkyl's thread built by Ocean at Chikara Motors and I found it interesting he modified his mainpipe which is 2" in diameter to a 2.5".

I'm wanting to go along the same path eventually with cams and IRTB but my car is bone stock at the moment. I recently scored a really good deal on a used Maxim NB header so I'm thinking about doing the same thing that Winkyl did and mate it to a custom 2.5" system.

Would this be wise? Or will I lose power? Either way I have to chop the mainpipe to make the NB version fit my NA. So question is should I keep it stock at 2" diameter or 2.5"?

Thanks!

Last edited by sifoo; 04-29-2012 at 06:16 AM. Reason: Zzz
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Old 04-29-2012, 06:26 AM   #2 (permalink)
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Before you go cutting that thing, sell it to me! You're gonna ruin it by cutting it up haha

Edit: to answer your question: if you are for sure gonna do semi-race cams and itbs, save your money and go 2.25 or 2.5 now. If not, keep it at 2.0 or go 2.25. 2.25 is an excellent middle ground and its the size exhaust I run on my bolt-on VVT motor
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Old 04-29-2012, 08:46 AM   #3 (permalink)
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Default Re: Changing Maxim works header mainpipe?

Quote:
Originally Posted by spitefulcheerio View Post
Before you go cutting that thing, sell it to me! You're gonna ruin it by cutting it up haha

Edit: to answer your question: if you are for sure gonna do semi-race cams and itbs, save your money and go 2.25 or 2.5 now. If not, keep it at 2.0 or go 2.25. 2.25 is an excellent middle ground and its the size exhaust I run on my bolt-on VVT motor
I was going to do just that before I read this article on the Maruha website:

http://www.maruhamotors.co.jp/miata/parts/vpheader.html

Basically, it says that their R&D shows on a mild cammed and tuned NA8 the optimal mainpipe diameter was 50mm. Larger diameters lost mid range and also top end. Which makes me conclude their is def. a ''science' behind header technology and its not simply a case of matching the mainpipe to the rest of your cat-back exhaust system.

Obviously, this R&D is different from the Chikara/Wynkyl build where he claims that his car 'felt less restricted' and pulled stronger towards the redline after modifying his mainpipe to 2.5" (which is equiv. to a whopping 63.50mm!!)

Help!
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Old 04-29-2012, 11:09 AM   #4 (permalink)
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Default Re: Changing Maxim works header mainpipe?

I say sell the Maxim Works header you bought and buy a Maruha VP header for $1500 plus. That way you get the Maruha Motors research and development which seems to be top of the line when it comes to naturally aspirated Miatas.
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Old 04-29-2012, 11:57 AM   #5 (permalink)
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Sell me that header!!!!

Seriously, don't go cutting up such a perfect design that took who knows how long to develop. Just sell it and get a different one
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Old 04-29-2012, 06:42 PM   #6 (permalink)
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Default Re: Changing Maxim works header mainpipe?

Ocean also modified my MaximWorks header. However for a supercharger application.
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Old 04-29-2012, 07:48 PM   #7 (permalink)
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Default Re: Changing Maxim works header mainpipe?

Quote:
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Ocean also modified my MaximWorks header. However for a supercharger application.
What type of power are you making Falcon? Is it a BP or B6? Thanks
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Old 04-29-2012, 10:40 PM   #8 (permalink)
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Default Re: Changing Maxim works header mainpipe?

B6, making 297whp with a Rotrex.
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